Follow two astronauts into outer space to explore time dilation and Einstein’s theory of relativity through the Twin Paradox thought experiment. -- On their 20th birthday, identical twin astronauts volunteer for an experiment. Terra will remain on Earth, while Stella will board a spaceship. Stella’s ship will travel to visit a star that is 10 light-years away, then return to Earth. As they prepare to part ways, the twins wonder what will happen when they’re reunited. Who will be older? Amber Stuver investigates the “Twin Paradox.” Lesson by Amber Stuver, directed by Aim Creative Studios. Sign up for our newsletter: http://bit.ly/TEDEdNewsletter Support us on Patreon: http://bit.ly/TEDEdPatreon Follow us on Facebook: http://bit.ly/TEDEdFacebook Find us on Twitter: http://bit.ly/TEDEdTwitter Peep us on Instagram: http://bit.ly/TEDEdInstagram View full lesson: https://ed.ted.com/lessons/einstein-s-twin-paradox-explained-amber-l-stuver Thank you so much to our patrons for your support! Without you this video would not be possible! Rare Media, Rayo, Faizan, Elizabeth Gu, Nazmul Idris, Po Foon Kwong, Siobhan O'Connor Gwozdz, NinjaBoffin, Jesse Jurman, Josue Perez Miranda, Jan-Erik, Scott Markley, Kaitlyn holland, Elija Peterson, Michele Lynn Rose, Jai Prasanth, Vack91, David Lucsanyi, Xavier dupont, Marisa Miller, Boytsov Ilya, Steven Razey, Javier Aldavaz, Nathan Giusti, Mada Arslan, Joichiro Yamada, Ritul Raghavan, Aline de Paula Zillig, Yambu Ganesh Shaw, Abeer Rajbeen, John Hong, Minh Tran, Helen Lee, Anthony Benedict, Turine Tran, Mathew Samuel, Karthik Balsubramanian, Lee, Livia-Alexandra Sarban, Annastasshia Ames, João Henrique Rodrigues, Sebastiaan Hols, Aries SW, SANG HAN, Amy Lopez, ReuniteKorea, Vinh-Thuy Nguyen, Liz Candee, Clovis Norroy and Danielle Downs.